package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.dto.PasswordEditDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.apache.commons.codec.cli.Digest;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;
import org.springframework.web.bind.annotation.RequestBody;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // 进行md5加密，然后再进行比对
        password = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工
     * @param employeeDTO
     */
    @Override
    public void save(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);
        // 设置员工状态
        employee.setStatus(StatusConstant.ENABLE);
        // 设置员工密码 默认密码123456
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));
        // 设置创建时间和修改时间
//        employee.setCreateTime(LocalDateTime.now());
//        employee.setUpdateTime(LocalDateTime.now());
        // 设置创建用户和修改用户
        // 从threadLocal中获取员工ID，jwt拦截器中放入的
//        employee.setCreateUser(BaseContext.getCurrentId());
//        employee.setUpdateUser(BaseContext.getCurrentId());
        // 持久化员工信息到数据库
        employeeMapper.save(employee);
    }


    /**
     * 员工分页查询
     * @param employeePageQueryDTO
     * @return
     */
    @Override
    public PageResult pageSize(EmployeePageQueryDTO employeePageQueryDTO) {
        // 给pageHelp插件构造分页查询条件 - 传入页码和每页条数
        // 该插件底层使用了TheadLocal将页码和每页条数保存，在真正执行SQL时使用了mybatis的拦截器功能对SQL进行增强
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());
        // 分页查询
        Page<Employee> employeePage = employeeMapper.pageQuery(employeePageQueryDTO);
        // 查询总条数
        long total = employeePage.getTotal();
        // 每页数据
        List<Employee> records = employeePage.getResult();
        return new PageResult(total, records);
    }

    /**
     * 修改员工状态  启用 / 禁用
     * @param status
     * @param id
     */
    @Override
    public void exchangeStatus(Integer status, Long id) {
        // 封装员工对象
        Employee employee = Employee.builder()
                .status(status)
                .id(id)
                .build();
        // 调用更新方法 （只要是更新员工信息，均可调用这个方法，会根据传入的员工对象中的ID进行更新）
        employeeMapper.update(employee);
    }

    /**
     * 根据ID查询员工
     * @param id
     * @return
     */
    @Override
    public Employee findByID(Long id) {
        Employee employee = employeeMapper.findById(id);
        employee.setPassword("****");
        return employee;
    }

    /**
     * 编辑员工信息
     * @param employeeDTO
     */
    @Override
    public void updateEmployee(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);
        // 修改更新时间
//        employee.setUpdateTime(LocalDateTime.now());
        // 修改更新人ID
//        employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.update(employee);
    }

    /**
     * 修改密码
     * @param passwordEditDTO
     */
    @Override
    public void editPassword(PasswordEditDTO passwordEditDTO) {
        Long empId = BaseContext.getCurrentId();
        Employee employee = employeeMapper.findById(empId);

        //处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }
        // 密码校验
        String oldPassword = passwordEditDTO.getOldPassword();
        oldPassword = DigestUtils.md5DigestAsHex(oldPassword.getBytes());
        if (!oldPassword.equals(employee.getPassword())) {
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }
        // 修改密码
        employee.setPassword(DigestUtils.md5DigestAsHex(passwordEditDTO.getNewPassword().getBytes()));
        employeeMapper.update(employee);
    }
}
